Each number in the series is being multiplied by (2 + (n-1)) where n = the term in the series
3 x 2 = 6
6 x 3 = 18
18 * 4 = 72
72 x 5 = 360
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11 comes next.
It is: 4554
0.01215
A series is a set of partial sums of sequences of numbers. A single number, such as 135, does cannot define a series.
17 cause it is the next prime number